//date  格式化函数
Date.prototype.format = function (fmt) {
    var o = {
        "M+": this.getMonth() + 1, //月份
        "d+": this.getDate(), //日
        "h+": this.getHours(), //小时
        "m+": this.getMinutes(), //分
        "s+": this.getSeconds(), //秒
        "q+": Math.floor((this.getMonth() + 3) / 3), //季度
        "S": this.getMilliseconds() //毫秒
    };
    if (/(y+)/.test(fmt)) {
        fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
    }
    for (var k in o) {
        if (new RegExp("(" + k + ")").test(fmt)) {
            fmt = fmt.replace(
                RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
        }
    }
    return fmt;
};

//通过number构造日期
var date1=new Date(2012,0,1);

//通过string 构造日期
var date2=new Date('2012-11-11 00:00:00');
var date3=new Date('2012/11/10 00:00:00');

console.log(date1.format("yyyy-MM-dd hh:mm:ss"));
console.log(date2.format("yyyy-MM-dd hh:mm:ss"));
console.log(date3.format("yyyy-MM-dd hh:mm:ss"));

var time2=date2.getTime()
var time3=date3.getTime();

var spanDay=(time2-time3)/(1000*60*60*24);
console.log(spanDay);

// 日期加减,为当前系统时间 五天后
var fiveDaysAfterToday=new Date();
fiveDaysAfterToday.setDate(fiveDaysAfterToday.getDate()+5);

console.log(fiveDaysAfterToday.format("yyyy-MM-dd hh:mm:ss"));



